Valve-grinder.



I. C. SMITH.

VALVE GRINDER.

APELIUATION FILED DEG. 21,1908.

942,222. v Patented Dec. 7, 1909.

showing the grinder in use.

Invia` c. SMITH, orLos ANGELES, CALIFQRNA.

VALVFGRINDER.

I specification Letters Patent. Patented Dee. 7, 1902.;

Application led December 21, 1908. Serial No. 468,502. i

To all whom 'it may concern:

Beit known that I, IRvIN C. SMITH, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new and useful-Improvements in Valve-Grinders, of which the following is a specification. t In the operation of grinding valves, conical or other circular valves which may be rotated on their seats, it is desirable to not rotate the .valve through a whole revolution on the seat as such an operation is not conducive to true grinding. The best motion which can be obtained is one of oscillation through a small angle, the valve being removed from the seatfrom time to time to allow a rearrangement of the grinding -powder which is introduced between the valve and the seat. The motion given lby the ngers grasping th'e valve stem and oscillating the stem 1s precisely the motiondesired but the tediousness of theoperat-ion is infinite. Moreover-the length of time necessary for the grinding of avalve by hand is quite extensive and the results are not so uniform as when performed bythe aid of a machine.

The present invention relates to a valve grinder which is of simple construction and which duplicates the motion above described. .'lhe main object of construction has been to make the machine as simple as possible so as to reduce the cost to a minimum and at the same time -to make the machine'eiiicient in its workings.

rlhe lnvention eonslsts broadly 1n a cam mechanism to oscillatea shaft to which the .the invention lies and thisl will be more clearly understood from the following description and the accompanying drawings, in which.-

Figure l is a sectional side elevation t Fig. 2 is a front elevation-of the grinder with a different style of connecting tool therein. Fig. 3 is a section taken on line 3-3 of Fig. 1. Referring now more particularly to the drawings, 5 designates a frame which, in the present construction, is of a generall U- shape as that shape most conveniently accommodates the mechanism of the grinder. The frame is provided with a handle 6 on its upper part by means of which the whole machine may be supported and steadied when in use.

Mounted in the outer ends ofthe ,frame is a vertical shaft 7, vbeing free lto revolve but held against longitudinal movement by Jbeing set 1n a closed endedv hole inthe upper part of the frame and having a collar 8 secured on it above the lower part of the frame., AThe shaft projects below the `frame and isprovided with a sleeve 9 set thereon and projecting beyond its end for the reception of the connectingtool'. A set screwI 10 is provided for the securing'of. theconnecting tool in the sleeve.

Mounted in the bearing 11 on the frame is a transverse shaft 12 having a crank handle-13 set on its end so that it ma be rotated manually. Mounted on the shaft on the inside of the frame is a cam 14, the curve "of the cam lying in a cylindrical surface ends rollers 18 engaging with the curved face, of cam` 14. The configuration of the face, and the angle it makes to the shaft, are such that both rollers are continually in touchwith the face, a smooth movement of the rollers and the arln being thereby ef.- fected. This condition will be most clearly seen by reference to Fig. 3 where the cam is shown in cross section. The angle of the cam face to the cam shaft varies as the face proceeds around the cam so that the rollers always follow `iiatly upon the face. This variation is shown most clearly in Fig. 1 `where the high-portions are shown to have faces sloping in one direction and the low portions faces sloping in the opposite direction.

`In the operation of this device a suitable connectin tool is set in the lower end of sleeve 9 with the aid of set screw 10. In the drawings a screw driver 20 with a long shank 21 is shown in Fig. 2. It will be understood, however, that the tool forms no part in the invention and that it may be changed as desired. The screw drlver is placed.. in engagement with the valve, a

. vbetween the valve and the seat, the valve is forced down upon'the seat with a proper pressure upon handle 6. After turning crank 13 for a short time the pressure is removed from the handle and the valve alloWed to rise E the seat, spring 9A: being of sufficient strength to raise the valve and the grinder. The operation is repeated asmany times as desired for the thorough ittlng of the valve and seat.

From the foregoing it Will be seen that the invention consists broadl in the combination of an oscillating sha t With a manually operated cam for actuating the shaft. The

minor points of construction may be varied to suit any class of work, the form shown being particularly adapted to the grinding of small valves such as are used in automobile engines and the like.

Having described my invention, what I claim is.-

1. A valve grinder, comprising a -frame having a handle thereon for manual operation, a `Vertical shaft journaled in the" Whosecurves lie in a cylindrical surface around the shaft, and a cam follower mounted on the vertical shaft.

2. A valve grinder, comprising a frame, a longitudinal shaft journaled in the frame, means on the shaft for engagement with a Valve, a transverse shaft- ]ournaled in the frame, a cam mounted on the transverse shaft, and a cam follower mounted on the longitudinal shaft. v

In Witness that I claim the foregoing I have hereunto subscribed my name this 14th day. of December 1908.

IRVIN C. SMITH.

Witnesses:

JAS. H., BALLAGH, JAMES T. BARKELEW. 

